| Free Bus-line | P1 | 1 |   | 1R | B | Busy |
| Free Bus-line | P2 | 2 | 2R | F16 | Function | |
| Individual Patch Contact | P3 | 3 | 3R | F8 | Function | |
| Individual Patch Contact | P4 | 4 | 4R | F4 | Function | |
| Individual Patch Contact | P5 | 5 | 5R | F2 | Function | |
| Command Accepted | X | 6 | 6R | F1 | Function | |
| Inhibit | I | 7 | 7R | A8 | Sub-address | |
| Clear | C | 8 | 8R | A4 | Sub-address | |
| Station Number | N | 9 | 9R | A2 | Sub-address | |
| Look-at-Me | L | 10 | 10R | A1 | Sub-address | |
| Strobe 1 | S1 | 11 | 11R | Z | Initialize | |
| Strobe 2 | S2 | 12 | 12R | Q | Response | |
| MSB | W24 | 13 | 13R | W23 |   | |
| 24 Write Bus-lines | W22 | 14 | 14R | W21 | ||
| W20 | 15 | 15R | W19 | |||
| W18 | 16 | 16R | W17 | |||
| W16 | 17 | 17R | W15 | |||
| W14 | 18 | 18R | W13 | |||
| W12 | 19 | 19R | W11 | |||
| W10 | 20 | 20R | W9 | |||
| W8 | 21 | 21R | W7 | |||
| W6 | 22 | 22R | W5 | |||
| W4 | 23 | 23R | W3 | |||
| W2 | 24 | 24R | W1 | LSB | ||
| MSB | R24 | 25 | 25R | R23 |   | |
| 24 Read Bus-lines | R22 | 26 | 26R | R21 | ||
| R20 | 27 | 27R | R19 | |||
| R18 | 28 | 28R | R17 | |||
| R16 | 29 | 29R | R15 | |||
| R14 | 30 | 30R | R13 | |||
| R12 | 31 | 31R | R11 | |||
| R10 | 32 | 32R | R9 | |||
| R8 | 33 | 33R | R7 | |||
| R6 | 34 | 34R | R5 | |||
| R4 | 35 | 35R | R3 | |||
| R2 | 36 | 36R | R1 | LSB | ||
| -12V DC | -12V | 37 | 37R | -24 | -24V DC | |
| +200V DC * | +HV | 38 | 38R | -6 | -6V DC | |
| 117V AC Line * | ACL | 39 | 39R | ACN | 117V AC Neutral * | |
| Reserved ** | Y1 | 40 | 40R | E | Clean Earth | |
| +12V DC | +12V | 41 | 41R | +24 | +24V DC | |
| Reserved ** | Y2 | 42 | 42R | +6 | +6V DC | |
| 0V (Power Return) | 0 | 43 | 43R | 0 | 0V (Power Return) | |
| * The +200VDC and 117VAC pins are no longer used | ||||||
| ** On DSP 60 Amp crates, Y1 = -6VDC and Y2 = +6VDC | ||||||
| Individual Patch Contact | P1 | 1 |   | 1R | B | Busy |
| Individual Patch Contact | P2 | 2 | 2R | F16 | Function | |
| Individual Patch Contact | P3 | 3 | 3R | F8 | Function | |
| Individual Patch Contact | P4 | 4 | 4R | F4 | Function | |
| Individual Patch Contact | P5 | 5 | 5R | F2 | Function | |
| Command Accepted | X | 6 | 6R | F1 | Function | |
| Inhibit | I | 7 | 7R | A8 | Sub-address | |
| Clear | C | 8 | 8R | A4 | Sub-address | |
| Individual Patch Contact | P6 | 9 | 9R | A2 | Sub-address | |
| Individual Patch Contact | P7 | 10 | 10R | A1 | Sub-address | |
| Strobe 1 | S1 | 11 | 11R | Z | Initialize | |
| Strobe 2 | S2 | 12 | 12R | Q | Response | |
| 24 Individual Look-at-Me Lines | L24 | 13 | 13R | N24 | 24 Individual Station Number Lines | |
| L23 | 14 | 14R | N23 | |||
| L22 | 15 | 15R | N22 | |||
| L21 | 16 | 16R | N21 | |||
| L20 | 17 | 17R | N20 | |||
| L19 | 18 | 18R | N19 | |||
| L18 | 19 | 19R | N18 | |||
| L17 | 20 | 20R | N17 | |||
| L16 | 21 | 21R | N16 | |||
| L15 | 22 | 22R | N15 | |||
| L14 | 23 | 23R | N14 | |||
| L13 | 24 | 24R | N13 | |||
| L12 | 25 | 25R | N12 | |||
| L11 | 26 | 26R | N11 | |||
| L10 | 27 | 27R | N10 | |||
| L9 | 28 | 28R | N9 | |||
| L8 | 29 | 29R | N8 | |||
| L7 | 30 | 30R | N7 | |||
| L6 | 31 | 31R | N6 | |||
| L5 | 32 | 32R | N5 | |||
| L4 | 33 | 33R | N4 | |||
| L3 | 34 | 34R | N3 | |||
| L2 | 35 | 35R | N2 | |||
| L1 | 36 | 36R | N1 | |||
| -12V DC | -12V | 37 | 37R | -24 | -24V DC | |
| No Connection | NC | 38 | 38R | -6 | -6V DC | |
| No Connection | NC | 39 | 39R | NC | No Connection | |
| Reserved ** | Y1 | 40 | 40R | E | Clean Earth | |
| +12V DC | +12V | 41 | 41R | +24 | +24V DC | |
| Reserved ** | Y2 | 42 | 42R | +6 | +6V DC | |
| 0V (Power Return) | 0 | 43 | 43R | 0 | 0V (Power Return) | |
| ** On DSP 60 Amp crates, Y1 = -6VDC and Y2 = +6VDC | ||||||